I believe all cities people love to visit were built organically by huge numbers if individual actors doing what they thought best with their part of it.
Or are there any preplanned great cities I'm not aware of?
Or are there any preplanned great cities I'm not aware of?
Also, once you go beyond Eixample (except to the east) the city's not a regular grid anymore. In the end, Eixample and other, newer neighbourhoods built on a grid probably represent a (substantial, of course) minority of the city.